M52737SP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M52737SP

3-CHANNEL VIDEO PREAMPLIFIER WITH OSD MIXING, RETRACE BLANKING

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (Monitor)

M52737SP

3-CHANNEL VIDEO PREAMPLIFIER WITH OSD MIXING, RETRACE BLANKING

V14th Clamp pulse threshold voltage

1. Measuring conditions are as given in Supplementary Table.

2. Turn down the SG4 input level gradually, monitoring the output

(about 1.8 VDC). Measure the top level of input pulse when the

output pedestal voltage turn decrease with unstable.

W14 Clamp pulse minimum width

Decrease the SG4 pulse width gradually, monitoring the output.

Measure the SG4 pulse width (a point of 1.5V) when the output

pedestal voltage turn decrease with unstable.

PDCH Pedestal voltage temperature characteristics1

PDCL Pedestal voltage temperature characteristics2

1. Measuring conditions are as given in Supplementary Table.

2. Measure the pedestal voltage at room temperature.

The measured value is called PDC1.

3. Measure the pedestal voltage at temperatures of -20°C and

85°C. The measured value is called, respectively, PDC2 and

PDC3.

4. PDCH=PDC1 - PDC2

PDCL=PDC1 - PDC3

OTr OSD pulse characteristics1

OTf OSD pulse characteristics2

1. Measuring conditions are as given in Supplementary Table.

Control the MAIN OSD ADJUST(V36) in order that the amplitude

of output signal is 3.0VP-P. Control the BRIGHTNESS(V19) in

order that the Black level of output signal is 2.0V.

2. Measure the time needed for the input pulse to rise from 10% to

90% (OTr1) and to fall from 90% to 10% (OTf1) with an active

prove.

3. Measure the time needed for the output pulse to rise from 10% to

90% (OTr2) and to fall from 90% to 10% (OTf2) with an active

prove.

4. Pulse characteristics Tr and Tf are calculated by the equations

below :

OTr (nsec)= (OTr2)2-(OTr1)2

OTf (nsec)= (OTf2)2-(OTf1)2

Oaj2 OSD adjusting control characteristics (minimum)

∆Oaj2 OSD adjusting control relative characteristics

(minimum)

Measuring conditions and procedure are the same as described in

Note 23, except that V36 is set to 0V.

OSDth OSD input threshold voltage

1. Measuring conditions are as given in Supplementary Table.

2. Reduce the SG6 input level gradually, monitoring output.

Measure the SG6 level when the output reaches 0V.

The measured value is called OSDth.

V1th BLK input threshold voltage

1. Measuring conditions are as given in Supplementary Table.

2. Make sure that signals are not being output synchronously with

SG6 (blanking period).

3. Reduce the SG6 input level gradually, monitoring output.

Measure the SG6 level when the blanking period disappears.

The measured value is called V1th.

HBLK Retrace BLK voltage

1. Measuring conditions are as given in Supplementary Table.

2. Monitoring to output at that time, read the level of retrace

blanking.

HVth Retrace BLK input threshold voltage

1. Measuring conditions are as given in Supplementary Table.

2. Confirm that output signal is being blanked by the SG7 at the

time.

Monitoring to output signal, decreasing the level of SG7.

Measure the top level of SG7 when the blanking period is

disappeared.

Oaj1 OSD adjusting control characteristics (maximum)

∆Oaj1 OSD adjusting control relative characteristics

(maximum)

1. Measuring conditions are as given in Supplementary Table.

2. Measure the output at T.P25 (30 or 35).

The pedestal level is called VLRA (VLGA or VLBA), and the OSD

level is called VHRA (VHGA or VHBA).

3. VLRA (VLGA or VLBA) is treated as Oaj1.

Oaj1=VORA (VOGA, VOBA) = VHRA-VLRA, (VHGA-VLGA, VHBA-VLBA)

4. OSD adjusting control relative characteristics ∆Oaj1 are

calculated by the equation below:

∆Oaj1=VORA/VOGA, VOGA/VOBA, VOBA/VORA

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